Malicious PDF — malware analysis report

Static analysis result for SHA-256 7138c7156e3dd5ad…

MALICIOUS

PDF

73.7 KB Created: 2020-08-03 09:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fee9b84dcdc8ff46b3dc14bf58d9ce8 SHA-1: c1f0b9baa157d0698c11e2c3a293e78250bd8bab SHA-256: 7138c7156e3dd5adc9de24443f63ba814da635bc72ee75d1650254ccb8265bd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=high+five+emoticons, which is likely used to redirect users to further malicious content. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=high+five+emoticons
    • http://files.icenibeaddesign.com/uploads/1/3/0/7/130776590/femudupu.pdf
    • http://files.baleupfeeders.com/uploads/1/3/2/6/132680901/4132632.pdf
    • http://files.jerryskeys.com/uploads/1/3/1/3/131398582/b534ab836981.pdf
    • http://files.brightfuturesfund.org/uploads/1/3/2/8/132815737/gezesonagorazekev.pdf
    • http://files.birchbrook2.com/uploads/1/3/0/7/130775968/5022723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0441/1149/5320/files/74416498606.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/73857574473.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/zerg_rush_hack.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/39972189364.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/zetowudonugibunojuber.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/bimore.pdf
    • https://cdn.shopify.com/s/files/1/0430/1419/3311/files/60006398435.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/febiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/50838746081.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/sims_3_wii.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/kozadut.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/lazuvufufeguxokegis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/goxixez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087f3.bin
76851d9d69662519b06a20c6fb31c2f122a9ec11a967aceb1806a922e11b8d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F3 7256 bytes
font_01_sfnt_off00009a6a.bin
b5ef3374f99549dec705033b586a96495f6a175cf8a51d85c7b603ede327ee53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6A 3112 bytes
font_02_sfnt_off0000a59a.bin
08b62261d4f8a548e6fedf994cb3ae88c3efbc344f662d3b32cdf97ecf1c5c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA59A 4976 bytes
font_03_sfnt_off0000b678.bin
23d19076fdf49acb2d32f99ea4039bf7c32918bc1e2a4611a462e48792008a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 7508 bytes
font_04_sfnt_off0000d049.bin
6bedbe5580b17a2650b50c1647daac7f852bb07f03ab684d4a088446befdb3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 11516 bytes
font_05_sfnt_off0000f708.bin
e46db79012125caeb00afdec6724f8332c56001bb20d2b2af3765f5c00094e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16224 bytes
font_06_sfnt_off00010c91.bin
c08514d7c914772e4dbfa793ae232efe074d17cc4b42067c439232d129188a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 2616 bytes

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